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This chapter is from the book

Exam Preparation Tasks

Review All Key Topics

Review the most important topics in the chapter, noted with the Key Topic icon in the outer margin of the page. Table 3-8 lists a reference of these key topics and the page numbers on which each is found.

key_topic.jpg

Table 3-8 Key Topics for Chapter 3

Key Topic Element

Description

Page Number

Paragraph

Describes the characteristics of Ethernet switching

59

Paragraph

Discusses Ethernet scaling

61

Paragraph

Covers 10-Gigabit Ethernet

62

Paragraph

Explains Ethernet autonegotiation

64

Paragraph

Covers interface selection for configuration

66

Paragraph

Explains how to configure the port speed

68

Paragraph

Explains how to configure the port duplex mode

69

Paragraph

Explains how to configure port error detection

69

Paragraph

Explains how to verify the port state

71

Paragraph

Explains how to verify port speed and duplex mode

72

Paragraph

Covers CDP neighbor discovery

73

Paragraph

Covers LLDP neighbor discovery

75

Paragraph

Describes Power over Ethernet for Cisco IP phones

77

Table 3-7

Lists IEEE 802.3af PoE device classes

79

Complete Tables and Lists from Memory

There are no memory tables in this chapter.

Define Key Terms

Define the following key terms from this chapter, and check your answers in the glossary:

  • CSMA/CD
  • duplex mode
  • autonegotiation
  • duplex mismatch
  • IEEE 802.3
  • CDP
  • LLDP
  • TLV
  • Power over Ethernet (PoE)
  • power class

Use Command Reference to Check Your Memory

This section includes the most important configuration and EXEC commands covered in this chapter. It might not be necessary to memorize the complete syntax of every command, but you should remember the basic keywords that are needed.

To test your memory of the port configuration commands, cover the right side of Tables 3-9 through 3-11 with a piece of paper, read the description on the left side, and then see how much of the command you can remember.

Table 3-9 Switch Port Configuration Commands

Task

Command Syntax

Select a port.

Switch(config)# interface type member/module/number

Select multiple ports.

Switch(config)# interface range type member/module/number [, type member/module/number ...]

or

Switch(config)# interface range type member/module/first-number - last-number

Define an interface macro.

Switch(config)# define interface-range macro-name type member/module/number [, type member/module/number ...] [ type member/module/first-number - lastnumber ] [...]

Switch(config)# interface range macro macro-name

Identify port.

Switch(config-if)# description description-string

Set port speed.

Switch(config-if)# speed {10 | 100 | 1000 | auto}

Set port mode.

Switch(config-if)# duplex {auto | full | half}

Detect port error conditions.

Switch(config-if)# errdisable detect cause [all | cause name]

Automatically recover from errdisable.

Switch(config-if)# errdisable recovery cause [ all | cause name ]

Switch(config-if)# errdisable recovery interval seconds

Manually recover from errdisable.

Switch(config-if)# shutdown

Switch(config-if)# no shutdown

Display ports in errdisable state

Switch(config)# show interface status err-disabled

Table 3-10 Neighbor Discovery Commands

Task

Command Syntax

Display CDP neighbor information.

Switch# show cdp neighbors [ type member/module/number ] [ detail ]

Control CDP operation globally.

Switch(config)# [no] cdp run

Control CDP operation on an interface.

Switch(config-if)# [ no ] cdp enable

Display LLDP neighbor information.

Switch(config)# show lldp neighbors [ type member/module/number ] [ detail ]

Control LLDP operation globally.

Switch(config)# [ no ] lldp run

Control LLDP operation on an interface.

Switch(config-if)# [ no ] lldp { receive | transmit }

Table 3-11 Power over Ethernet Commands

Task

Command Syntax

Set PoE behavior.

Switch(config-if)# power inline { auto | static } [ max milliwatts ]

Disable PoE on a switch port

Switch(config-if)# power inline never

Display PoE status.

Switch# show power inline [ type member/mod/num ] [ detail ]

Remember that the CCNP exam focuses on practical or hands-on skills that are used by a networking professional. Therefore, you should remember the commands needed to configure and test a switch interface.

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